Piston head construction



Aug. l1, 1936. F. R. MILLER 2,050,360

0 PISTON HEAD CONSTRUCTION FiledV June 25, 1935 2 Sheets-Sheet l A HomeyAug. 11, 1936.

F. R. MILLER 2,050,360 I PISTON HEAD CONSTRUCTION Filed June 25, 1955 2Sheets-Sheet 2 nveniof A Homey CII Patented ug. 11, 1.936

UNITED STATES PIs'roN HEAD CONSTRUCTION Y FrankR. Miller, QCherryvale,Kans., assigner of f one-half `to Archibald S.,McMillan, St. Louis,

Application June 25,1935, serial No. .28,363V

` i'claim. (cl. 309-31) blage being expanded under the control ofvalVed;

iiuid pressure means.

In reducing the inventive idea tov actual practice I have evolved andproduced an arrangement comprising a. pair of complemental sections. de-

iining the.` body portion proper, said sections being so fashioned andmatched as to accommodate therebetween a superposed ring assemblagehaving an expansible and contractible liner internally associatedtherewith whereby to provide a fluid chamber within'the piston headitself whereupon feeding fluid into the chamber maintains an outwardpressure upon the liner and associated packing rings to keep the ringsin constant contact with the wall of the cylinder,

Of specific importance, however, is the special adaptation and use ofcompanion head sections wherein one section is provided with a bushinghaving radial flanges to limit the inward radial contraction of thepiston ring assemblage, and said flanges serving further as supportingelements for coacting check valves designed to control the entrance andexit of the internal pressure producing medium.

It is my primary aim to generally improve upon piston head constructionsof this class by adopting a special arrangement of parts carefullyselected and mechanically coordinated to promote simplicity, durability,efficiency in operation, and to otherwise transcend in importance andoperation similar known structures.

Other features and advantages will become more readily apparent from thefollowing description and drawings.

In the drawings:

Figure 1 is a view in elevation showing the improved piston headconstruction and illustrating the manner in which it is mounted forreciprocation in a cylinder, casing or the like.

Figure 2 is a sectional view through the sectional head disclosing theinternal chambered formation and special fittings and valve elements'.

Figure 3 is a. horizontal section through the upper portion of thestructure.

Figure 4 is a side view of the valve carrier section.

Figure 5 is a fragmentary top plan view observing the inner cap-likesection.

Figure 6 is a fragmentary detail showing the assembling of the studs vonthe cap sectionA with the fins or flanges on the'companion valve carriersection. y Y

Referring now to the drawings by distinguishing reference numerals andespecially to the gen- 5 eral assembly shown in Figure 2, the outervalve carrier section is indicated by the numeral' I and the companioninner cap-like section is denoted bythe numeral 8,., The section 1 isbetter shown inlFig'ure 4 land from this it will be observed 10 that itvincludes avdiskflikerbody portion anda" central Lupstanding tubularportion which may be described as a guide and assembling bushing for theadjacent end portion I0 of the piston rod. The bushing 9 extends up intoiirmy abutl5 ting Contact with the disk-like body portion-of 1 thesection 8 and is provided with a'series of ria-1 Y dial iianges or wingsII. These wings are equidistant and circumferentially spaced and areeither in contact with or in close proximity to the 20 surrounding sheetmetal annulus I2. This part I2 is in effect an expansible andcontractible liner and has its ends overlapped as shown in Figure 3.

It serves as a lining for the superposed packing ring I3, these beinginterposed between the mar- 25 ginal or peripheral portions of thesections 8 and 9 as shown in Figure 2. Thus, we have an arrangementwhere the sections 'l and 8 are mounted on the rods I0 and spaced apartso as to provide a space to accommodate the packing ring 30 assembly.This comprises a ring I3 and the expansible and contractible inner wallor liner I2. This part I2 is spaced from the bushing 9 so as to define achamber into which the expanding fluid or water (not shown) is fed. Thewater is allowed to enter this chamber by way of the screw threadedcentrally bored nipples or ttings I4 and I5 carried by the sections 1and 8 respectively as shown in Figure 2. The inner ends oi the bushingsextend into the 40 'water chamber and serve as valve seats. They are soarranged as to accommodate the flexible fiap checknvalves I6 and I1.These valve units are of spring metal and the shank portions I8 areattached to opposed faces of an adjacent pair of flangesII.. y

It is to be observed that the free end of the piston rod IIJ is properlyheaded as indicated at I9 to maintain the proper assembling of parts. Inaddition, there is a clamping nut at 20 to'keepso the lparts together.

It will be observed that in assembling the device the part 1 is slippedonto'the rod I8 against the head I9 after which the packing rings and Nliner are assembled. Then the cap portion or inlow piston head withalternately operablefvalvef means therein and a centrally locatedpacking ring assembly which is pressedioutundertlie; pressure of thewater to insure rm-1eak-prooi"l contact with the casing or Wall of thecylinder 2| as shown in Figure 1.

In practice, I have found it expedient and practicable to provide thedisk-like body portio'n oftherpart witha seriesof guiding,studsorpins22.as shown in-Eigure. Theseare-,removably seatable in sockets formed inthe adjacent ends of the complementalillangesfY H. These pinsllttingintothe socketvserve topilotand` guidethe-par'ts ,together` They also,prevent theY relative. rotary movement when once the parts. are`assembled. This insures proper valve and,

valve. seat alignment.

It is thought that persons skilled in; the-art to which the inventionrelates will be able to ob tain a. clear understandingof the inventionafter considering the description in connection with the drawings.Therefore, a more lengthy description is regarded as unnecessary.

Minor changes in shape, size and rearrangement of parts coming withinthe field of invention claimed may be resorted to in actual practice, ifdesired.

Having thus described the invention what is claimed as new is:

In a piston head construction of the class described, a rod, an outersection provided with a central bushing surrounding the rod, saidbushing` being A`provided with a series of radial circumerentiallyspaced equi-distant anges, an inner section mounted on said rod andabutting l th'e adjacent end of said bushing and anges, said ilangeshaving sockets in the upper portions thereof.; studs iii-said innersection receivable in saidsockets, a plurality of packing rings arrangedin superposed relation between the marginal por- 2 tions of saidsections, eaclrof said sections being provided: with. centrally boredscrew threaded nipples-,athefnipples extending into thespace-outward1yof1thefbushing and. between the inner peripheral portionsof said packing rings, and altero nately disposed successivelyoperableresilient .iiap valves carried by predetermined iianges and ensgageablef-Withf the inner ends of said nipples wherebyrto. permit thenipples to serve as valve seats.

FRANK R. MILLER.

